SilkAir (Singapore) Private Limited (Chinese: 勝安航空 Shèngān Hángkōng) is an airline based in Singapore. It is a wholly owned subsidiary of Singapore Airlines and operates scheduled passenger services from Singapore to 39 cities in Southeast Asia, South Asia, China and Australia . It has its head office on the fifth storey of SIA Superhub 1. As the regional wing of Singapore Airlines, it serves the short-haul destinations in the Singapore Airlines Group network, and flew 1.56 million passengers in 2006. It made a profit of S$30 million, as turnover rose 20.4% to $415 million.

As of 31 March 2010, SilkAir employs 278 staff.

The airline had its roots as a regional air-charter company in the form of Tradewinds Charters, formed in 1976, and using planes predominantly leased from parent company Singapore Airlines serving leisure destinations. Scheduled services were introduced as Tradewinds Airlines on 21 February 1989, when it leased McDonnell Douglas MD-87 airplanes for services to six destinations, namely Bandar Seri Begawan, Pattaya, Phuket, Hat Yai and Kuantan from Singapore's Changi Airport and Tioman from Singapore's Seletar Airport. As the carrier matured, regional business destinations such as Jakarta, Phnom Penh and Yangon were added to its network, thereby broadening the airline's appeal beyond the holiday-maker to include the business traveller.